Cathode including a solid body
US5592043A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1996 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Apr 3, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Cathode including a solid body (4) which comprises metallic constituents (particularly W, Ni, Mg, Re, Mo, Pt) and oxidic constituents (such as particularly BaO, CaO, Al.sub.2 O.sub.3, Sc.sub.2 O.sub.3, SrO, ThO.sub.2, La.sub.2 O.sub.3). Also at low operating temperatures, high emission current densities and a long lifetime are achieved in that the structure of the constituents and the volume ratio v.sub.m of the metallic constituents relative to the overall volume of the solid body are chosen to be such that the resistivity .rho. has a value in the range of .rho..sub.0 .multidot.10.sup.-4 >.rho.>.rho..sub.m .multidot.10.sup.2, in which .rho..sub.0 and .rho..sub.m are the resistivities, defined at 20.degree. C., of the pure oxidic constituents and the pure metallic constituents, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.